This paper mainly presents the relations among moisture content density and claygrain content of pebble soil mass of weathered red mudstone of Badong Formation,Middle Trias.
The play is composed of Triassic-Jurassic source rock, Tertiary-Neogene, Cretaceous and Jurassic sandstone reservoir rock, and the seal rocks of regional Jurassic red mudstone and Tertiary-Neogene's salty gypseous mudstone.
The results show that: 1) the globally distributed CORBs were mainly present in late Cretaceous; 2)the paleoenvironment of the CORBs is deep water of low latitude area in general; 3)the lithologies are mainly consisted of red shale, red limestone, red marlstone, red mudstone and red siliciclastic shale;
Tataaiertag formation is subdivided into upper member with red-brownish and red mudstone intercalated with siltstone and lower member with purple-red mudstone.
There is a suit of red glutenite layer and red shale layer in Sunjiawan group layer. And a suit of red glutenite and red shale alternating layers in upper Fuxin group layer and a suit of gray glutenite and gray shale layer in below Fuxin group layer, nipped with thin coal and bind.
The differences between uranium-bearing and non-uranium sandstones and between red sandstone (claystone) and greenish sandstone can be determined by the gamma-ray spectroscopy (measuring U,Th and K) and XRF analysis (measuring As and Ba). Therefore, the prospecting of the sandstone-type uranium deposits in northern Sichuan can be concentrated in a certain ranse.
At Joggins, red mudstone units are about twice as abundant as the green mudstone units, yet the latter contain 26 charcoal horizons.
In the upper part of this slice, thin-bedded and slightly folded cherts alternate with red mudstone.
The lower six formations are dominantly red mudstone and yellowish-gray sandstone.
The red mudstone aquifer in Hengyang Basin consists of lacustrinefacies of late Cretaceous--Paleogene age with abundant fractures andcorrosional pore systems. Good ground water was found in this aquiferwith the pumping rates ranging from 300 to 700 cubic meters per day. Onthe basis of field investigation and experiment al data, this paper revealsthe mechanism of this phenomenon and the condition of water--bearingspace developrment. Sedimentary facies criteria for ground water predictionare also presented. Corrosional...
The red mudstone aquifer in Hengyang Basin consists of lacustrinefacies of late Cretaceous--Paleogene age with abundant fractures andcorrosional pore systems. Good ground water was found in this aquiferwith the pumping rates ranging from 300 to 700 cubic meters per day. Onthe basis of field investigation and experiment al data, this paper revealsthe mechanism of this phenomenon and the condition of water--bearingspace developrment. Sedimentary facies criteria for ground water predictionare also presented. Corrosional pores were formed from dissolution ofgypsum disseminated in rocks of salt lake sulphate subenvironment. Thedevelopment of corrosional pores and fractures closely associates withsedimentary facies in respect with structure, rhythmic layering and lithologicalcharacteristics of bed rocks. Sedimentary facies is the primary factor whichcontrols the distribution of good ground water. The secondary factor is theNeotectonic lifting which drives mudstone into an system open to theatmosphere, increasing ground water circulation.
The red mudstone acquifers in Hengyang Basin are relatively rich in groundwater contained in vugular pore space. In order to reveal the nature of the pheomenon, gypsum dissolution and calcite precipitation resulted from water-rock interaction are studied under the principles of thermodynamics. Processes of calcite precipitation are discussed in three aspects_1 common ion effect, proton transfor mation and complex formation.
Most geologists used to consider that the Kedoushan Formation belongs to theUpper Jurassic based on its lithogical character and fossils, and that it was equiv-alent to the famous Kienteh Group in the Shouchang Region, Zhejiang Prov-ince. The present paper considers that the Kedoushan Formation is a series ofstrata with a time span from Upper Jurassic to Lower Cretaceous. It can be di-vided into three parts according to lithological character; the upper part consist-ing of volcanic rocks;the middle part consisting...
Most geologists used to consider that the Kedoushan Formation belongs to theUpper Jurassic based on its lithogical character and fossils, and that it was equiv-alent to the famous Kienteh Group in the Shouchang Region, Zhejiang Prov-ince. The present paper considers that the Kedoushan Formation is a series ofstrata with a time span from Upper Jurassic to Lower Cretaceous. It can be di-vided into three parts according to lithological character; the upper part consist-ing of volcanic rocks;the middle part consisting of red-color sedimentary rocks;and the lower part consisting of greyish-green sedimentary rocks. They arenamed Beds a, b and c respectively in ascending order at the section of Wai-shan--Madaishan in this region. Both Beds a and b are abundantly fossilife-rous. The charophytes in the assemblage of Bed a consist of Aclistochara, Poro-chara, Latochara, Sphaerochara, Nodosoclavator, etc. Some of these species havebeen found (or are similar to those) from Kimmeridgian of Northwest Germanyand from the Morrison Formation of West America (Madler, 1952; Peck, 1937,1957), such as Aclistochara latisulcata Peck, A. obovata Peck, Porochara cf. kim-meridgensis, (Madler), P. cf. raskvae (Madler), Latochara cf. latitruncata (Peck),Sphaerochara cf. verticillata (Peck), S. cf. latifasciata (Peck), etc. The assem-blage resembles those of the Suining Formation, Upper Shaximiao Formation andPengleizhen Formation in Sichuan Province (Liu Junying, 1982). It also resem-bles those of the Xiangtan Formation and Datonghe Formation in the Xiningand Minhe Basins in Qinghai Province (Hao Yichun et al.,1983). Especially,thegenus Aclistochara is abundantly found in those regions. Some species of Stella-tochara spp. have never been found from the Cretaceous and younger strata.Therefore, based upon this charophytes assemblage, the author thinks that Bed abelongs to Late Jurassic age. A huge amount of Clavatoraceae (Charophyta) is found in Bed b, consist-ing of Flabellochara, Nodosoclavator.The genus Mesochara is also abundant in thisassemblage. Flabellochara is widely distributed in Early Cretaceous age allover the world, representing one of the index fossils from the Wealden Stage to the Aptian Stage. This indicates that Bed b of the Kedoushan Formationcertainly belongs to Early Cretaceous age. In this region, the upper volcanic rock usually overlies the different bedsof the lower deposit, and the volcanic rock mostly overlies Bed a directly. Theauthor can determine that there had occurred an elevation and that Bed b inmost sections had been eroded before the volcanic eruption of Bed c. According to the charophyte assemblages and the sedimentary character, asedimentary gap is not appreciable in this region between the Jurassic and Cre-taceous. A boundary between Upper Jurassic and Lower Cretaceous charophy-tes can be demarcated in the Kedoushan Formation. Only Bed a belongs to theUpper Jurassic.
红色泥岩
red mudstone
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